Clistrocystis graptolithofilius, known from Ordovician glacial boulders from Poland, was described by R. Kozłowski (1959) as an enigmatic organic fossil. These distinctive forms were epibionts on Mastigograptus colonies.
Later, R. Kozłowski (1965) reinterpreted Clistrocystis as probable cephalopod egg capsules, laid down on graptolite stipes.
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A. Ordovician Clistrocystis graptolithofilius on Mastigograptus stipe.
B. Egg capsules of Recent Sepia officinalis on the seagrass Zostera.
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